Set Commands

Set commands allow you to store unique string elements. Sets are unordered and do not allow duplicate elements. Multiple set operations such as intersection and union are supported.

Command List

SADD

Adds one or more members to a set

SCARD

Returns the number of elements in a set

SINTER

Returns the intersection of all given sets

SISMEMBER

Determines whether a member is a member of a set

SMEMBERS

Returns all members in a set

SPOP

Removes and returns a random element from a set

SRANDMEMBER

Returns one or more random members from a set without removing them

SREM

Removes one or more members from a set

SUNION

Returns the union of all given sets

SUNIONSTORE

Stores the union of all given sets in a specified set

SDIFFSTORE

Computes the difference of all given sets and stores it in a specified set

SINTERSTORE

Computes the intersection of all given sets and stores it in a specified set

SMOVE

Moves a member from one set to another

Use Cases

Set commands are ideal for tag systems, friend relationships, deduplication statistics, and other scenarios. Due to the uniqueness characteristic of sets, deduplication functions can be easily implemented, while set operations can conveniently handle relational queries.

For detailed usage and parameters of each command, please refer to the individual command documentation linked above.